Accession Number : AD0631422

Title :   STRESS AGING: A NEW TREATMENT FOR ALLOYS. PART FOUR: COMPARISON OF STANDARD TENSILE PROPERTIES FOR SINGLE VS. DUPLEX STRESS-AGING (THREE ULTRA-HIGH-STRENGTH STEELS).

Descriptive Note : Technical rept.,

Corporate Author : WATERVLIET ARSENAL N Y BENET LABS

Personal Author(s) : Harrington,Richards H.

Report Date : MAR 1966

Pagination or Media Count : 35

Abstract : For alloys with a high capacity for single stress-aging, duplex stress-aging may yield further gains in useful strength without destructive losses in elongation and 'Relative Toughness'. With duplex stress-aging, the proportional limits are higher than the initial tensile strengths of these three steels. Duplex stress-aging resulted in increases of 50,000 psi for the 0.1% offset yield strength for 4340 steel; 75,000 psi for the yield strength of 4335 Si-Modified; and up to 90,000 psi for the yield strength of 300M steel. For different duplex treatments, 300M steel develops proportional limits from 280,000 to 300,000 psi; yield strengths from 300,000 to 315,000 psi; elongations from 7 to 5%; reduction of area values from 34% to 31%. On a yield strength-to-density basis, duplex stress-aged 4335 Si-Modified is about equal to titanium alloy while duplex stress-aged 300M appears to be superior to any commercial alloy. (Author)

Descriptors :   (*ALLOYS, AGING(MATERIALS)), (*AGING(MATERIALS), STEEL), (*STEEL, TENSILE PROPERTIES), STRESSES, TOUGHNESS, TITANIUM ALLOYS, HEAT, SILICON

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE